drivers/mtd/Kconfig - maze/linux - Git at Google

 menuconfig MTD
 	tristate "Memory Technology Device (MTD) support"
 	depends on HAS_IOMEM
 	help
 	  Memory Technology Devices are flash, RAM and similar chips, often
 	  used for solid state file systems on embedded devices. This option
 	  will provide the generic support for MTD drivers to register
 	  themselves with the kernel and for potential users of MTD devices
 	  to enumerate the devices which are present and obtain a handle on
 	  them. It will also allow you to select individual drivers for
 	  particular hardware and users of MTD devices. If unsure, say N.

 if MTD

 config MTD_DEBUG
 	bool "Debugging"
 	help
 	  This turns on low-level debugging for the entire MTD sub-system.
 	  Normally, you should say 'N'.

 config MTD_DEBUG_VERBOSE
 	int "Debugging verbosity (0 = quiet, 3 = noisy)"
 	depends on MTD_DEBUG
 	default "0"
 	help
 	  Determines the verbosity level of the MTD debugging messages.

 config MTD_TESTS
 	tristate "MTD tests support"
 	depends on m
 	help
 	  This option includes various MTD tests into compilation. The tests
 	  should normally be compiled as kernel modules. The modules perform
 	  various checks and verifications when loaded.

 config MTD_PARTITIONS
 	bool "MTD partitioning support"
 	help
 	  If you have a device which needs to divide its flash chip(s) up
 	  into multiple 'partitions', each of which appears to the user as
 	  a separate MTD device, you require this option to be enabled. If
 	  unsure, say 'Y'.

 	  Note, however, that you don't need this option for the DiskOnChip
 	  devices. Partitioning on NFTL 'devices' is a different - that's the
 	  'normal' form of partitioning used on a block device.

 if MTD_PARTITIONS

 config MTD_REDBOOT_PARTS
 	tristate "RedBoot partition table parsing"
 	---help---
 	  RedBoot is a ROM monitor and bootloader which deals with multiple
 	  'images' in flash devices by putting a table one of the erase
 	  blocks on the device, similar to a partition table, which gives
 	  the offsets, lengths and names of all the images stored in the
 	  flash.

 	  If you need code which can detect and parse this table, and register
 	  MTD 'partitions' corresponding to each image in the table, enable
 	  this option.

 	  You will still need the parsing functions to be called by the driver
 	  for your particular device. It won't happen automatically. The
 	  SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
 	  example.

 if MTD_REDBOOT_PARTS

 config MTD_REDBOOT_DIRECTORY_BLOCK
 	int "Location of RedBoot partition table"
 	default "-1"
 	---help---
 	  This option is the Linux counterpart to the
 	  CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK RedBoot compile time
 	  option.

 	  The option specifies which Flash sectors holds the RedBoot
 	  partition table.  A zero or positive value gives an absolute
 	  erase block number. A negative value specifies a number of
 	  sectors before the end of the device.

 	  For example "2" means block number 2, "-1" means the last
 	  block and "-2" means the penultimate block.

 config MTD_REDBOOT_PARTS_UNALLOCATED
 	bool "Include unallocated flash regions"
 	help
 	  If you need to register each unallocated flash region as a MTD
 	  'partition', enable this option.

 config MTD_REDBOOT_PARTS_READONLY
 	bool "Force read-only for RedBoot system images"
 	help
 	  If you need to force read-only for 'RedBoot', 'RedBoot Config' and
 	  'FIS directory' images, enable this option.

 endif # MTD_REDBOOT_PARTS

 config MTD_CMDLINE_PARTS
 	bool "Command line partition table parsing"
 	depends on MTD_PARTITIONS = "y" && MTD = "y"
 	---help---
 	  Allow generic configuration of the MTD partition tables via the kernel
 	  command line. Multiple flash resources are supported for hardware where
 	  different kinds of flash memory are available.

 	  You will still need the parsing functions to be called by the driver
 	  for your particular device. It won't happen automatically. The
 	  SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
 	  example.

 	  The format for the command line is as follows:

 	  mtdparts=<mtddef>[;<mtddef]
 	  <mtddef>  := <mtd-id>:<partdef>[,<partdef>]
 	  <partdef> := <size>[@offset][<name>][ro]
 	  <mtd-id>  := unique id used in mapping driver/device
 	  <size>    := standard linux memsize OR "-" to denote all
 	  remaining space
 	  <name>    := (NAME)

 	  Due to the way Linux handles the command line, no spaces are
 	  allowed in the partition definition, including mtd id's and partition
 	  names.

 	  Examples:

 	  1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
 	  mtdparts=sa1100:-

 	  Same flash, but 2 named partitions, the first one being read-only:
 	  mtdparts=sa1100:256k(ARMboot)ro,-(root)

 	  If unsure, say 'N'.

 config MTD_AFS_PARTS
 	tristate "ARM Firmware Suite partition parsing"
 	depends on ARM
 	---help---
 	  The ARM Firmware Suite allows the user to divide flash devices into
 	  multiple 'images'. Each such image has a header containing its name
 	  and offset/size etc.

 	  If you need code which can detect and parse these tables, and
 	  register MTD 'partitions' corresponding to each image detected,
 	  enable this option.

 	  You will still need the parsing functions to be called by the driver
 	  for your particular device. It won't happen automatically. The
 	  'physmap' map driver (CONFIG_MTD_PHYSMAP) does this, for example.

 config MTD_OF_PARTS
 	def_bool y
 	depends on OF
 	help
 	  This provides a partition parsing function which derives
 	  the partition map from the children of the flash node,
 	  as described in Documentation/powerpc/booting-without-of.txt.

 config MTD_AR7_PARTS
 	tristate "TI AR7 partitioning support"
 	---help---
 	  TI AR7 partitioning support

 endif # MTD_PARTITIONS

 comment "User Modules And Translation Layers"

 config MTD_CHAR
 	tristate "Direct char device access to MTD devices"
 	help
 	  This provides a character device for each MTD device present in
 	  the system, allowing the user to read and write directly to the
 	  memory chips, and also use ioctl() to obtain information about
 	  the device, or to erase parts of it.

 config HAVE_MTD_OTP
 	bool
 	help
 	  Enable access to OTP regions using MTD_CHAR.

 config MTD_BLKDEVS
 	tristate "Common interface to block layer for MTD 'translation layers'"
 	depends on BLOCK
 	default n

 config MTD_BLOCK
 	tristate "Caching block device access to MTD devices"
 	depends on BLOCK
 	select MTD_BLKDEVS
 	---help---
 	  Although most flash chips have an erase size too large to be useful
 	  as block devices, it is possible to use MTD devices which are based
 	  on RAM chips in this manner. This block device is a user of MTD
 	  devices performing that function.

 	  At the moment, it is also required for the Journalling Flash File
 	  System(s) to obtain a handle on the MTD device when it's mounted
 	  (although JFFS and JFFS2 don't actually use any of the functionality
 	  of the mtdblock device).

 	  Later, it may be extended to perform read/erase/modify/write cycles
 	  on flash chips to emulate a smaller block size. Needless to say,
 	  this is very unsafe, but could be useful for file systems which are
 	  almost never written to.

 	  You do not need this option for use with the DiskOnChip devices. For
 	  those, enable NFTL support (CONFIG_NFTL) instead.

 config MTD_BLOCK_RO
 	tristate "Readonly block device access to MTD devices"
 	depends on MTD_BLOCK!=y && BLOCK
 	select MTD_BLKDEVS
 	help
 	  This allows you to mount read-only file systems (such as cramfs)
 	  from an MTD device, without the overhead (and danger) of the caching
 	  driver.

 	  You do not need this option for use with the DiskOnChip devices. For
 	  those, enable NFTL support (CONFIG_NFTL) instead.

 config FTL
 	tristate "FTL (Flash Translation Layer) support"
 	depends on BLOCK
 	select MTD_BLKDEVS
 	---help---
 	  This provides support for the original Flash Translation Layer which
 	  is part of the PCMCIA specification. It uses a kind of pseudo-
 	  file system on a flash device to emulate a block device with
 	  512-byte sectors, on top of which you put a 'normal' file system.

 	  You may find that the algorithms used in this code are patented
 	  unless you live in the Free World where software patents aren't
 	  legal - in the USA you are only permitted to use this on PCMCIA
 	  hardware, although under the terms of the GPL you're obviously
 	  permitted to copy, modify and distribute the code as you wish. Just
 	  not use it.

 config NFTL
 	tristate "NFTL (NAND Flash Translation Layer) support"
 	depends on BLOCK
 	select MTD_BLKDEVS
 	---help---
 	  This provides support for the NAND Flash Translation Layer which is
 	  used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
 	  file system on a flash device to emulate a block device with
 	  512-byte sectors, on top of which you put a 'normal' file system.

 	  You may find that the algorithms used in this code are patented
 	  unless you live in the Free World where software patents aren't
 	  legal - in the USA you are only permitted to use this on DiskOnChip
 	  hardware, although under the terms of the GPL you're obviously
 	  permitted to copy, modify and distribute the code as you wish. Just
 	  not use it.

 config NFTL_RW
 	bool "Write support for NFTL"
 	depends on NFTL
 	help
 	  Support for writing to the NAND Flash Translation Layer, as used
 	  on the DiskOnChip.

 config INFTL
 	tristate "INFTL (Inverse NAND Flash Translation Layer) support"
 	depends on BLOCK
 	select MTD_BLKDEVS
 	---help---
 	  This provides support for the Inverse NAND Flash Translation
 	  Layer which is used on M-Systems' newer DiskOnChip devices. It
 	  uses a kind of pseudo-file system on a flash device to emulate
 	  a block device with 512-byte sectors, on top of which you put
 	  a 'normal' file system.

 	  You may find that the algorithms used in this code are patented
 	  unless you live in the Free World where software patents aren't
 	  legal - in the USA you are only permitted to use this on DiskOnChip
 	  hardware, although under the terms of the GPL you're obviously
 	  permitted to copy, modify and distribute the code as you wish. Just
 	  not use it.

 config RFD_FTL
         tristate "Resident Flash Disk (Flash Translation Layer) support"
 	depends on BLOCK
 	select MTD_BLKDEVS
 	---help---
 	  This provides support for the flash translation layer known
 	  as the Resident Flash Disk (RFD), as used by the Embedded BIOS
 	  of General Software. There is a blurb at:

 		http://www.gensw.com/pages/prod/bios/rfd.htm

 config SSFDC
 	tristate "NAND SSFDC (SmartMedia) read only translation layer"
 	depends on BLOCK
 	select MTD_BLKDEVS
 	help
 	  This enables read only access to SmartMedia formatted NAND
 	  flash. You can mount it with FAT file system.


 config SM_FTL
 	tristate "SmartMedia/xD new translation layer"
 	depends on EXPERIMENTAL && BLOCK
 	select MTD_BLKDEVS
 	select MTD_NAND_ECC
 	help
 	  This enables EXPERIMENTAL R/W support for SmartMedia/xD
 	  FTL (Flash translation layer).
 	  Write support is only lightly tested, therefore this driver
 	  isn't recommended to use with valuable data (anyway if you have
 	  valuable data, do backups regardless of software/hardware you
 	  use, because you never know what will eat your data...)
 	  If you only need R/O access, you can use older R/O driver
 	  (CONFIG_SSFDC)

 config MTD_OOPS
 	tristate "Log panic/oops to an MTD buffer"
 	help
 	  This enables panic and oops messages to be logged to a circular
 	  buffer in a flash partition where it can be read back at some
 	  later point.

 	  To use, add console=ttyMTDx to the kernel command line,
 	  where x is the MTD device number to use.

 config MTD_SWAP
 	tristate "Swap on MTD device support"
 	depends on MTD && SWAP
 	select MTD_BLKDEVS
 	help
 	  Provides volatile block device driver on top of mtd partition
           suitable for swapping.  The mapping of written blocks is not saved.
 	  The driver provides wear leveling by storing erase counter into the
 	  OOB.

 source "drivers/mtd/chips/Kconfig"

 source "drivers/mtd/maps/Kconfig"

 source "drivers/mtd/devices/Kconfig"

 source "drivers/mtd/nand/Kconfig"

 source "drivers/mtd/onenand/Kconfig"

 source "drivers/mtd/lpddr/Kconfig"

 source "drivers/mtd/ubi/Kconfig"

 endif # MTD
	menuconfig MTD
	tristate "Memory Technology Device (MTD) support"
	depends on HAS_IOMEM
	help
	Memory Technology Devices are flash, RAM and similar chips, often
	used for solid state file systems on embedded devices. This option
	will provide the generic support for MTD drivers to register
	themselves with the kernel and for potential users of MTD devices
	to enumerate the devices which are present and obtain a handle on
	them. It will also allow you to select individual drivers for
	particular hardware and users of MTD devices. If unsure, say N.

	if MTD

	config MTD_DEBUG
	bool "Debugging"
	help
	This turns on low-level debugging for the entire MTD sub-system.
	Normally, you should say 'N'.

	config MTD_DEBUG_VERBOSE
	int "Debugging verbosity (0 = quiet, 3 = noisy)"
	depends on MTD_DEBUG
	default "0"
	help
	Determines the verbosity level of the MTD debugging messages.

	config MTD_TESTS
	tristate "MTD tests support"
	depends on m
	help
	This option includes various MTD tests into compilation. The tests
	should normally be compiled as kernel modules. The modules perform
	various checks and verifications when loaded.

	config MTD_PARTITIONS
	bool "MTD partitioning support"
	help
	If you have a device which needs to divide its flash chip(s) up
	into multiple 'partitions', each of which appears to the user as
	a separate MTD device, you require this option to be enabled. If
	unsure, say 'Y'.

	Note, however, that you don't need this option for the DiskOnChip
	devices. Partitioning on NFTL 'devices' is a different - that's the
	'normal' form of partitioning used on a block device.

	if MTD_PARTITIONS

	config MTD_REDBOOT_PARTS
	tristate "RedBoot partition table parsing"
	---help---
	RedBoot is a ROM monitor and bootloader which deals with multiple
	'images' in flash devices by putting a table one of the erase
	blocks on the device, similar to a partition table, which gives
	the offsets, lengths and names of all the images stored in the
	flash.

	If you need code which can detect and parse this table, and register
	MTD 'partitions' corresponding to each image in the table, enable
	this option.

	You will still need the parsing functions to be called by the driver
	for your particular device. It won't happen automatically. The
	SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
	example.

	if MTD_REDBOOT_PARTS

	config MTD_REDBOOT_DIRECTORY_BLOCK
	int "Location of RedBoot partition table"
	default "-1"
	---help---
	This option is the Linux counterpart to the
	CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK RedBoot compile time
	option.

	The option specifies which Flash sectors holds the RedBoot
	partition table. A zero or positive value gives an absolute
	erase block number. A negative value specifies a number of
	sectors before the end of the device.

	For example "2" means block number 2, "-1" means the last
	block and "-2" means the penultimate block.

	config MTD_REDBOOT_PARTS_UNALLOCATED
	bool "Include unallocated flash regions"
	help
	If you need to register each unallocated flash region as a MTD
	'partition', enable this option.

	config MTD_REDBOOT_PARTS_READONLY
	bool "Force read-only for RedBoot system images"
	help
	If you need to force read-only for 'RedBoot', 'RedBoot Config' and
	'FIS directory' images, enable this option.

	endif # MTD_REDBOOT_PARTS

	config MTD_CMDLINE_PARTS
	bool "Command line partition table parsing"
	depends on MTD_PARTITIONS = "y" && MTD = "y"
	---help---
	Allow generic configuration of the MTD partition tables via the kernel
	command line. Multiple flash resources are supported for hardware where
	different kinds of flash memory are available.

	You will still need the parsing functions to be called by the driver
	for your particular device. It won't happen automatically. The
	SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
	example.

	The format for the command line is as follows:

	mtdparts=<mtddef>[;<mtddef]
	<mtddef> := <mtd-id>:<partdef>[,<partdef>]
	<partdef> := <size>[@offset][<name>][ro]
	<mtd-id> := unique id used in mapping driver/device
	<size> := standard linux memsize OR "-" to denote all
	remaining space
	<name> := (NAME)

	Due to the way Linux handles the command line, no spaces are
	allowed in the partition definition, including mtd id's and partition
	names.

	Examples:

	1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
	mtdparts=sa1100:-

	Same flash, but 2 named partitions, the first one being read-only:
	mtdparts=sa1100:256k(ARMboot)ro,-(root)

	If unsure, say 'N'.

	config MTD_AFS_PARTS
	tristate "ARM Firmware Suite partition parsing"
	depends on ARM
	---help---
	The ARM Firmware Suite allows the user to divide flash devices into
	multiple 'images'. Each such image has a header containing its name
	and offset/size etc.

	If you need code which can detect and parse these tables, and
	register MTD 'partitions' corresponding to each image detected,
	enable this option.

	You will still need the parsing functions to be called by the driver
	for your particular device. It won't happen automatically. The
	'physmap' map driver (CONFIG_MTD_PHYSMAP) does this, for example.

	config MTD_OF_PARTS
	def_bool y
	depends on OF
	help
	This provides a partition parsing function which derives
	the partition map from the children of the flash node,
	as described in Documentation/powerpc/booting-without-of.txt.

	config MTD_AR7_PARTS
	tristate "TI AR7 partitioning support"
	---help---
	TI AR7 partitioning support

	endif # MTD_PARTITIONS

	comment "User Modules And Translation Layers"

	config MTD_CHAR
	tristate "Direct char device access to MTD devices"
	help
	This provides a character device for each MTD device present in
	the system, allowing the user to read and write directly to the
	memory chips, and also use ioctl() to obtain information about
	the device, or to erase parts of it.

	config HAVE_MTD_OTP
	bool
	help
	Enable access to OTP regions using MTD_CHAR.

	config MTD_BLKDEVS
	tristate "Common interface to block layer for MTD 'translation layers'"
	depends on BLOCK
	default n

	config MTD_BLOCK
	tristate "Caching block device access to MTD devices"
	depends on BLOCK
	select MTD_BLKDEVS
	---help---
	Although most flash chips have an erase size too large to be useful
	as block devices, it is possible to use MTD devices which are based
	on RAM chips in this manner. This block device is a user of MTD
	devices performing that function.

	At the moment, it is also required for the Journalling Flash File
	System(s) to obtain a handle on the MTD device when it's mounted
	(although JFFS and JFFS2 don't actually use any of the functionality
	of the mtdblock device).

	Later, it may be extended to perform read/erase/modify/write cycles
	on flash chips to emulate a smaller block size. Needless to say,
	this is very unsafe, but could be useful for file systems which are
	almost never written to.

	You do not need this option for use with the DiskOnChip devices. For
	those, enable NFTL support (CONFIG_NFTL) instead.

	config MTD_BLOCK_RO
	tristate "Readonly block device access to MTD devices"
	depends on MTD_BLOCK!=y && BLOCK
	select MTD_BLKDEVS
	help
	This allows you to mount read-only file systems (such as cramfs)
	from an MTD device, without the overhead (and danger) of the caching
	driver.

	You do not need this option for use with the DiskOnChip devices. For
	those, enable NFTL support (CONFIG_NFTL) instead.

	config FTL
	tristate "FTL (Flash Translation Layer) support"
	depends on BLOCK
	select MTD_BLKDEVS
	---help---
	This provides support for the original Flash Translation Layer which
	is part of the PCMCIA specification. It uses a kind of pseudo-
	file system on a flash device to emulate a block device with
	512-byte sectors, on top of which you put a 'normal' file system.

	You may find that the algorithms used in this code are patented
	unless you live in the Free World where software patents aren't
	legal - in the USA you are only permitted to use this on PCMCIA
	hardware, although under the terms of the GPL you're obviously
	permitted to copy, modify and distribute the code as you wish. Just
	not use it.

	config NFTL
	tristate "NFTL (NAND Flash Translation Layer) support"
	depends on BLOCK
	select MTD_BLKDEVS
	---help---
	This provides support for the NAND Flash Translation Layer which is
	used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
	file system on a flash device to emulate a block device with
	512-byte sectors, on top of which you put a 'normal' file system.

	You may find that the algorithms used in this code are patented
	unless you live in the Free World where software patents aren't
	legal - in the USA you are only permitted to use this on DiskOnChip
	hardware, although under the terms of the GPL you're obviously
	permitted to copy, modify and distribute the code as you wish. Just
	not use it.

	config NFTL_RW
	bool "Write support for NFTL"
	depends on NFTL
	help
	Support for writing to the NAND Flash Translation Layer, as used
	on the DiskOnChip.

	config INFTL
	tristate "INFTL (Inverse NAND Flash Translation Layer) support"
	depends on BLOCK
	select MTD_BLKDEVS
	---help---
	This provides support for the Inverse NAND Flash Translation
	Layer which is used on M-Systems' newer DiskOnChip devices. It
	uses a kind of pseudo-file system on a flash device to emulate
	a block device with 512-byte sectors, on top of which you put
	a 'normal' file system.

	You may find that the algorithms used in this code are patented
	unless you live in the Free World where software patents aren't
	legal - in the USA you are only permitted to use this on DiskOnChip
	hardware, although under the terms of the GPL you're obviously
	permitted to copy, modify and distribute the code as you wish. Just
	not use it.

	config RFD_FTL
	tristate "Resident Flash Disk (Flash Translation Layer) support"
	depends on BLOCK
	select MTD_BLKDEVS
	---help---
	This provides support for the flash translation layer known
	as the Resident Flash Disk (RFD), as used by the Embedded BIOS
	of General Software. There is a blurb at:

	http://www.gensw.com/pages/prod/bios/rfd.htm

	config SSFDC
	tristate "NAND SSFDC (SmartMedia) read only translation layer"
	depends on BLOCK
	select MTD_BLKDEVS
	help
	This enables read only access to SmartMedia formatted NAND
	flash. You can mount it with FAT file system.


	config SM_FTL
	tristate "SmartMedia/xD new translation layer"
	depends on EXPERIMENTAL && BLOCK
	select MTD_BLKDEVS
	select MTD_NAND_ECC
	help
	This enables EXPERIMENTAL R/W support for SmartMedia/xD
	FTL (Flash translation layer).
	Write support is only lightly tested, therefore this driver
	isn't recommended to use with valuable data (anyway if you have
	valuable data, do backups regardless of software/hardware you
	use, because you never know what will eat your data...)
	If you only need R/O access, you can use older R/O driver
	(CONFIG_SSFDC)

	config MTD_OOPS
	tristate "Log panic/oops to an MTD buffer"
	help
	This enables panic and oops messages to be logged to a circular
	buffer in a flash partition where it can be read back at some
	later point.

	To use, add console=ttyMTDx to the kernel command line,
	where x is the MTD device number to use.

	config MTD_SWAP
	tristate "Swap on MTD device support"
	depends on MTD && SWAP
	select MTD_BLKDEVS
	help
	Provides volatile block device driver on top of mtd partition
	suitable for swapping. The mapping of written blocks is not saved.
	The driver provides wear leveling by storing erase counter into the
	OOB.

	source "drivers/mtd/chips/Kconfig"

	source "drivers/mtd/maps/Kconfig"

	source "drivers/mtd/devices/Kconfig"

	source "drivers/mtd/nand/Kconfig"

	source "drivers/mtd/onenand/Kconfig"

	source "drivers/mtd/lpddr/Kconfig"

	source "drivers/mtd/ubi/Kconfig"

	endif # MTD